dotfiles/modules/nixpkgs.nix

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Nix
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2024-02-12 10:10:32 +01:00
{ config, lib, ... }:
with lib;
let
cfg = config.my.nixpkgs;
overlayType = mkOptionType {
name = "nixpkgs-overlay";
description = "nixpkgs overlay";
check = lib.isFunction;
merge = lib.mergeOneOption;
};
in
{
options.my.nixpkgs = {
overlays = mkOption {
default = [ ];
type = types.listOf overlayType;
example = literalExpression
''
[
(self: super: {
openssh = super.openssh.override {
hpnSupport = true;
kerberos = self.libkrb5;
};
})
]
'';
};
channels = mkOption {
default = { };
example = literalExpression ''
{
stable = inputs.nixpkgs-stable;
}
'';
type = with types; attrsOf package;
};
overlaysForAllChannels = mkEnableOption "apply overlays for all channels";
};
config.nixpkgs = {
overlays =
let
channelOverlays = _: prev:
mapAttrs
(_: value:
import value {
inherit (prev) system;
overlays = optional cfg.overlaysForAllChannels cfg.overlays;
}
)
cfg.channels;
in
cfg.overlays ++ [ channelOverlays ];
config.allowUnfree = true;
};
}